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Microwaves and phonons in 1D transmission lines: Giant Cross-Kerr effect, QND Photon Detection and Giant Atoms

Presented by: 
G Johansson Chalmers University of Technology
Date: 
Tuesday 5th August 2014 - 15:30 to 16:10
Venue: 
INI Seminar Room 1
Abstract: 
In this talk, I’ll discuss the physics of microwave photons moving in a coplanar wave-guide (1D transmission line) interacting with one or more artificial atoms. Compared to the optical regime, the microwave regime allows for strong and stable coupling of the photons to (artificial) atoms. In particular, I’ll discuss the possibility of using the giant cross-Kerr effect for QND detection of propagating microwave photons. Motivated by recent experiments, I’ll also discuss what happens when the microwave photons are replaced by surface acoustic wave (SAW) phonons. The phonon velocity is five orders of magnitude slower, implying that the atom is now substantially larger than the wavelength for its spontaneous emission.
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University of Cambridge Research Councils UK
    Clay Mathematics Institute The Leverhulme Trust London Mathematical Society Microsoft Research NM Rothschild and Sons